Which of the following statements is/are true? (a). engineers apply tolerances to part dimensions to reduce the amount of variation that occurs during production of part. (b). best engineering practice is to design and manufacture parts to a highly precise tolerances. (c). tighter tolerances are an indication of a better product design. (d). a and b. (e). a, b and c. d o (f). a and c only.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.